The Park spans over an area of 820sq. Km which includes Rajaji, Motichur and Chilla wildlife sanctuaries, parts of Dehradun, Siwalik and Lansdowne Forest Divisions. These three sanctuaries were amalgamated in 1983 to Rajaji National Park, named after the Late Raja Gopal Chariya. The majestic Ganges flows through the National Park for a distance of 24km, besides the innumerable streams and brooks making it rich and diverse. It offers ample opportunities to nature lovers to enjoy the captivating landscape and wildlife.

Rajaji is thickly foliated predominantly by the Sal Forest and a number of other forest types which include the Western Gangetic Moist and Northern dry Deciduous and Khair-Sissoo forests. Low Alluvial Savannah Woodlands cover the drier southern margins of the park, in contrast to the Siwalik Chir-Pine on the high reaches of the hills.

The park is home to the Cheetal, hog deer, barking deer, Sambar deer, wild boar,  antelopes such as the Nilgai, Goral and of course the Asian Elephant.

The park also protects carnivores such as the Tiger and the Leopard and the lesser carnivores like the Jackal, Hyena, Jungle Cat, Leopard Cat, Civets, Himalayan Yellow-Throated Marten and Sloth Bears.

The primates include the Rhesus Macaque and the Hanuman Langur.

The Indian hare and the Indian Porcupine are among the small mammals found in the park.

Reptiles in Rajaji include one of the largest Pythons, King Cobra, Common Krait, Indian Cobra and the Monitor Lizard.

The park also houses over four hundred bird species. The Great Pied Hornbill, Himalayan Pied Kingfisher and fire tailed sunbird are some of the residents of our retreat.

This area is the first staging ground after the migratory birds cross over the mighty Himalayas into the Indian subcontinent.

Rajaji National Park and the Wild Brook Retreat give you all the excitement and exhilaration of holidaying in the heart of the Indian wildlife. Just where all the action is. In the lap of Nature at its most raw and where the law of the jungle prevails. Predators prowl the wild pathways, the deer call for help, birds shriek in the skies and reptiles slither across the earth.

The Avifauna in the Rajaji National Park
There are about 315 species of birds that inhibit this park. India's National bird, Peacock is found here in abundance. Innumerable variety off butterflies and small birds add to the beauty of this place. Rusty cheaked Scimitar, Babbler, Golden-spected Warbler, Chestnut-tailed Starling, Brown Hawk-Owl, Drongo Cuckoo, Indian Roller, Parakeets, Hornbill, Red Jungle Fowl, Barbet, Kingfishers, Oriole, Kaleej Pheasant, Woodpecker, Finch, Thrushes and so on. Winter season sees a large number of migratory birds visiting the sanctuary.

Reptiles
Reptiles seen at the park comprise of Monitor Lizard, along with King Cobra, Python and a number of other snakes.

Fish
Ganga and Song rivers, flowing through the park, are home to a wide variety of fish, like Goonch, Trout, Kalabanse, Mahaseer and Chilwa.